The British film industry should back more mainstream movies, a report is expected to recommend next week.
Ahead of a visit to Pinewood Studios on Wednesday, Prime Minister David Cameron said the film industry should support "commercially successful pictures".
His comments come before the publication of Lord Smith's review into the government's film policy on Monday.
The review was commissioned to find out how the industry could offer better support to UK film-making.
Mr Cameron praised the UK film industry but said "we should aim even higher, building on the incredible success of recent years".
He acknowledged the British film industry had made "a £4bn contribution to the UK economy and an incalculable contribution to our culture".
Lord Smith, the former Labour culture secretary, is also expected to recommend developing an export strategy to increase the profits of British films.
Speaking to the BBC, director Ken Loach said it was important to have a diverse film industry with a wide range of films to choose from.
"If everyone knew what would be successful before it was made, there would be no problem," he said.
"What you need to do is fund a lot of different, varied projects and then you'll get a really vibrant industry."
Loach added he would encourage more independent cinemas, saying: "The market does not provide choice if you don't intervene."
The report follows the abolition of the UK Film Council last year, which handed over its funding responsibilities to the British Film Institute (BFI).
Speaking at the time, Lord Smith said: "We want to hear from everyone involved in UK films.
"Film-makers, distributors, audiences and experts can all offer a useful perspective on how Government policy can help our film industry grow."
The principal objectives of the review were to identify obstacles to greater success in the British film industry, to determine how to spend increased Lottery funding and bolstering audience demand for film, including independent British film.
Last year saw the highest grossing independent British film of all time, The King's Speech, pick up four Oscars.
The big screen spin-off from E4's The Inbetweeners recorded the biggest opening for a UK-produced comedy, and had made £45m at the box office by November last year.